How severe is CVE-2023-51639?

CVE-2023-51639 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-51639 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-51639?

CVE-2023-51639 affects Alltena Allegra. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-51639?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2023-51639 have an EU (EUVD) identifier?

Yes. CVE-2023-51639 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-56351.

When was CVE-2023-51639 published?

CVE-2023-51639 was published on 2024-11-22 and last updated on 2026-06-17.

CVE-2023-51639

CVE-2023-51639 is a critical-severity vulnerability in Alltena Allegra with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-56351
Weakness: CWE-22
Affected product: Alltena Allegra
Published: 2024-11-22
Last modified: 2026-06-17

Description

Allegra downloadExportedChart Directory Traversal Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Allegra. Authentication is not required to exploit this vulnerability. The specific flaw exists within the downloadExportedChart action. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-22361.

Frequently asked questions

What is CVE-2023-51639?: Allegra downloadExportedChart Directory Traversal Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Allegra. Authentication is not required to exploit this vulnerability. The specific flaw exists within the downloadExportedChart action. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-22361.
How severe is CVE-2023-51639?: CVE-2023-51639 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-51639 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-51639?: CVE-2023-51639 affects Alltena Allegra. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-51639?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2023-51639 have an EU (EUVD) identifier?: Yes. CVE-2023-51639 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-56351.
When was CVE-2023-51639 published?: CVE-2023-51639 was published on 2024-11-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:alltena:allegra:*:*:*:*:*:*:*:*

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